Hand nailer



July l0, 1962 1 FRosTAD ET A1.

HAND NAILER 6 Sheets-SheeiI 1 Filed Dec. 5, 1959 mv md INVENTORS Lars'osfad Hei/ro T. de Man l. 3mm# @aman ATTORNEY July 10, 1952 l.. FRosTADET AL 3,042,925

HAND MAILER Filed Deo. 3,v 1959 6 Sheets-Sheet 2 INV ENTORS Lars Pros/adHe/7r0 7.' deMan .fmma# ompam ATTORNEY July 10, 1962 l.. FRosTAD ET ALHAND NAILER 6 Sheets-Sheet 3 Filed Dec. 3, 1959 INVENTORS ,Lars FrosfadHel/ro 7. deMan 5mn# W ATTORNEY July 10, 1962 l.. FRosTAD ETAL 3,042,925

HAND NAILER ,Filed Dec. 3, 1959 6 Sheets-Sheet 4 INVENTORS Lars FrosladHei/ro 7.' de Man ATTORNEY July 10, 1962 l.. FRos-rAD ETA.

HAND NAILER 6 Sheets-Sheet 5 Filed Dec. 5, 1959 IIO INVENTORS LarsFrosted Hei/ro 7.' de Man nme# ampdan ATTORNEY 6 Sheets-Sheet 6INVENTORS Lars F rosfad Heiko 7.' deMan nme# M404 ATTORNEY July 10, 1962L. FRosTAD ETAL HAND MAILER Filed Deo. .3, 1959 IIG Ebates Thisinvention relates to nail drivers of the type wherein nails areautomatically and successively fed to a nail discharge passage, thenails being driven through the discharge passage into the work piece bydownward movement of a plunger and nail driving blade carried thereby,the downward movement of the plunger being effected by being struck by ahammer, or mallet.

Nail drivers of this type are used, for example, in the laying ofhardwood floors. They are equipped with magazines containing asubstantial supply of nails, all whereby the nails are driven morerapidly in the most suitable part of rthe work piece, or floorboard, andare driven with lessefort.

This structure has as an object a nail driver embodying a magazinestructure which is convenient to load and which functions efliciently tosuccessively deliver nails to the nail delivery passage.

The invention has as a further object a full stroke mechanism to preventupward or return movement of the driving plunger until the nail beingdriven has been driven home, this mechanism embodying a structure whichis entirely reliable and free from maintenance, and economical toconstruct.

The invention consists in the novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawings in which like characters designate corresponding parts in allthe views.

In the drawings- FIGURE 1 is a side elevational view of a nail driverembodying our invention.

FIGURE 2 is a view, similar to FIGURE 1, with one side of the bodybroken away, and one side of the nail magazine removed, and with theforward or head portion of the device shown in vertical section.

FIGURE 3 is a comparable view to the upper right portion of FIGURE 2 butshowing the driving plunger in down position.

FIGURE 4 is a view, similar to FIGURE 3, showing the plunger inpartially downward position.

FIGURE 5 is a transverse sectional View taken on a line corresponding toline 5 5, FIGURE 2.

FIGURE 6 is a side elevational view with one side of the body brokenaway, the magazine being shown in side elevation and positioned in themagazine chamber.

FIGURE 7 is a View, similar to FIGURE 6, with the magazine moved to openloading position.

FIGURE 8 is a front end elevational view of the shear FIGURE 13 is anelevational view of the lower por-V tion of the front surface of theplunger, and

FIGURE 14 is a top plan view of the pawl employed in the full strokemechanism.

icc

The nailer consists of a body formed of two similar parts 20, 21, formedat their forward ends with upwardly extending projections 22, 23, toprovide a head portion. The parts 20, 21, extend rearwardly from thehead portion to a rear portion 25, which curves upwardly and forwardlyto form a handle 26. The body parts 20, 21, are spaced apart throughouttheir intermediate portions to form a magazine receiving chamber 27extending rearwardly from the head portions 23 to the rear portion 25.This chamber 27 is for the reception of a nail magazine which is hereshown in the form of two similar parts 30, 31, the upper edges of whichare formed with flanges 32 secured together as by rivets 33 forming atop rib projecting upwardly between inwardly extending flanges '36, seeFIGURE 5, formed on the upper edges of the body parts 20, 21.

'I'he confronting sides of the parts 30, '31, are formed with grooves 37to receive the heads 38 of the nails 40, the nail heads being supportedon ribs 41. Below the ribs 41, the parts 30, 31, are formed withrectangular grooves 43 of substantial dimension to provide a rectangularpassageway 44 to slidably receive a pusher 45. The bottom walls of thegrooves 43 terminate in spaced apart relation to provide a slot for thepassage of a handle 46 which is bent to extend laterally through a slot47 formed in the body piece 20', the handle havingV a cylindricalportion 48 extending laterally from theside of the body with which thepusher 45 can be conveniently retracted, or moved rearwardly, againstthe action of a spring 50' which extendsV rearwardly up into the handleportion 26, see FIGURE 2, and is captivated by a plug 51. vThe pusher45i'and spring 50 serve to yieldingly advance the nails 40 forwardlyalong the guideway toward the head portion.

The forward end of the magazine'is mounted upon pivot pins 52 in theform of dog point screws threaded into the body members 20, 21. Theforward ends ofthe magazine parts 30, 31, are inclined, as -at 55, topermit the magazine to be moved downwardly about the pivot 52 to theopen position shown in FIGURE 7. The pusher 45, when retracted to therear portion 25, is retained in retracted position by a latch 57 pivotedin the body parts, as at 5S, and 'having a hook end 59 engaging adownwardly extending projection 60 on the under side of the .pusher 45.The latch is urged to latching position by a spring 61, see FIGURES 6and 7.

' Means is provided for detachably holding the magazine in the chamber27. As shown in FIGURES 2, 6 and 7, a latch pin 63 is mounted in therear body portion 25 for axial movement, the pin being urged forwardlyby a compression spring 64 to position the forward end of the pin intothe upper portion 37 of the nailguide plate. -This effects a releasablemeans for holding the magazine in the magazine receiving chamber andwith the nail guideway arranged in alignment with the nail dischargepassage hereinafter referred to. The latch pin 63 is formed with acollar 67 against which the spring 64 acts. The pusher 45 is formed withan upwardly extending projection 68 so arranged that when the pusher ismoved to retracted position, as shown in FIGURES 6 and 7, the projection68 engages the collar 67, moving the latch pin 63 rearwardlyl out ofengagement with the magazine. `The latch 57 is released from the pusherby pressing inwardly on the tail portion 69 of the latch 57.V In orderto prevent accidental release of the pusher when the magazine is in theloading position sh'own in FIGURE 7, the rib portions 32 of the magazineparts are formed attheir rear ends with upwardly extending projections70 and are so dimensioned that when the magazine is in open position,the projections 70 provide an interference to prevent forward movementof the pusher 45. For devices of this type, the nails are usuallyseverally attachedl together by glue, so that the nails are handled instick form for loading the magazine.

The forward ends yof the -body parts 20, 21, terminate short oftheforward edges, ofthe .upwardly extending projections 22, 23, `and thereisY positioned on the forward ends of the tbody parts` a shear plate'72, V,This plate is Y Vformed with a slot 73 extending upwardly fromits lower edge andV communicating -with an elliptical shaped aperk `ture74. The upper portions of the magazine slide'parts 30, 31, above therecess 44, extend forwardly as at 75 parts 20, 21, and extending alongthepside edges of the t plate 72. The nose piece S1 is iixedly securedto the members 20, 21, by screws 83v extending through apertures 84 inthe shear plate and being lthreaded into the members 20, 21. The nosepiece is formed with the vertically disposed nail delivery passage 80. Y

VThe upwardly extending portion, vformed by the prtions 22, 23, of thebody members, is formed with a square passageway in which there ismounted two U-shaped members 86, 87, having theirY side flanges abuttingand being formed of wear resistant metal to provide a bushing in whichthe plunger 88 is slidably mounted. The plunger isformed on oppositesides with lengthwise extending recesses 89. Thermembers 22, 23, areformed to provide `vertically elongated apertures 90 which extendtransversely of the axis of the plunger 88 andr communicate with grooves91 extending inla direction axially of theplunger in adjacency to thebushing members 86, 87. Members V93 are slidably mounted in thevrecesses 91. The lower ends of these members are provided withtransversely extending threaded apertures to receive screws 94, thelheads of which are positioned in the apertures 90, the screws havinginner portions 95 of reduced diameter extending into the grooves 89formed'in the sides of the plunger-88. These screws terminate short ofthe `lbottom whereby, when Ythe plunger is in the up position as shownin FIGURES 1 and 2, the inner ends 95 ofthe screws 94V are-engaged bythebottom of the slots 89'. AThe members or blocks 93 4are slidably mountedin the recesses 91 and are urgeddownwardly by compression 'springs 97.This Y arrangement provides a yieldable bumper when the plunger isreturned to up position by the compression This structure consists inthe plunger 88 being formed on its rear side with a surface 116confronting a pawl 108 mounted in the head portion 23 o-f the machine.The surface 116 has a vertical or lengthwise dimension of the plungersuch that it is engaged by the pawl when the plunger is intermediateitsV up `and down positions. The lower-end vof this surface 1,16y isdened by a recess 104, and the upper end of the 'surface is defined by arecess 106. As illustrated inFIGURE 2, with the plunger 88 in its upposition, the surfacel 116 is, positioned albove the pawl and, asillustrated in FIGURE 3with the plunger in its down position, thesurface 116 :is positioned below the pawl.

The body members 22, 23, are formed in their confronting sides in thehead portion'of the machine with concavitiesY 107 in which the pawl 108is mounted. This pawl is formed with trunnions 109, see FIGURE 14,journalled in bushings 110. This pivot point is spaced laterally fromthe surface 116 of the plunger 88 such that the free end 111,of the pawlwill engage the surface 116 prior to thepawlV assuming a position normalto the plunger. In other words, the'engagement of the pawl with surface111 is cant-fashion, as shown in FIGURE 4.

spring 98 which encircles a guide rod 99, the spring rex- 'i tendingupwardly in an axially extending hole 100 formed in the plunger' 88.

The forward side of the plunger 88, see FIGURE 13, is formed at .itslower end` with la groove 101 extending upwardly Vvfrom the lower-'edgeof the plunger'and communicating with a circular recess .102. 1y A naildriving Vblade 103 is formed lat its upper end complemental to the Y'recesses 101,102, and depends from the plunger with the lower end of thelblad'e 103 positioned just above the nail .delivery passage 80'whe'nthe plunger is in its up'position,

see FIGURE 2. When the plunger 88 reaches the bottom of its strokethelower end of the blade 103is positioned which might result .in the nextnail in the magazine being jammed in the passage A80 partiallyoocupiedpby the partiallydriven nail. Y v

As illustrated in FIGURES 2, 3 and 4, the pawl 108 is urged toa positionnormal to the axis of the plunger by leaf springs 112 positioned'in therecess 107, the pawl being shown in such position in FIGURE 4.

As the plunger moves downwardly, the lower edge of the surface 116engages the pawl and moves it downwardly 4about its pivot 109,- theplunger passing freely downwardly. However, the vpawl has now beencanted, as shown in FIGURE 4, whereby any retrograde or upward movementof the plunger is prevented by the pawl. When the plunger has reachedthe bottom of its stroke Iand the nail has been driven home, the surface116 has passed belowA the :area in whichthe pawl is mounted and theupper recess 105 yprovidesspace for the pawl to again assume positionnormal to the plunger. The pawl does `not interfere with upward returnmovement of the plunger from its downrposition. As the plunger movesupwardly under thev inuence `of the spring 98, the free inner end of thepawl will be engaged by the upper end of the surface 116, .and the pawlwill be oantedgupwardly so Jthat it does not bind the plunger upon itsupper return movement.

. In the modified form shown in FIGUREV l5, the pawl is pivotallymounted in a bearing yieldingly mounted in the machine for movementinadirection laterally from the plunger 88. Such an arrangement can beeconomically provided Yby mounting the bearingybushing 110 in a block118 of yieldable material such as rubber. The block 118 is mounted inconcavities 119 ysimilarly located tothe concavities 107 in thearrangement previously described. This block 118 mayfalso function toyieldingly urge the pawl 108 in position normalto the axis Vof theplunger, this being accomplished Y,by forming the block 118 with upperVandlower lip portions 1,20 extending inwardly toward the plunger forengaging the pawl after the manner Y of the springs'112 in FIGURE 4.This pivotal mounting of the pawl for yielding movement in a directionaway from the plunger avoids the precision machining and mounting of thepawl pivot as in the4 arrangement shown in FIGURES 2, 3 and4. VThisyielding movement of the pawl pivot also provides for the releasement ofthe pawl in the event i-t should become jammed against the plunger. Theyieldable mount being suflcient for the full stroke control' of theplunger in normal operation but being yieldable to release the plungerinthe event of jamming.

In operating Vthe nailer, the pusher 45 is'moved to the rear portion 25of the body by means of the handle 48. The pusher is retained in thisrear portion by the latch 57. This movement of the pusher into latchedposition re- =leases the restraining pin 63 whereupon the magazine maybe moved downwardly out of the body about the pivot 52 to the positionshown'in FIGURE 7. In` this position, a row of nails can be convenientlyinserted in the guideway of the magazine. The magazine is then movedinto the body and the pusher released by pressing upwardly on the tailportion 69 of the latch 57.

The pusher is advanced forwardly against the row of nails by the spring50, and forward movement of the pusher releases the retaining member 63for engagement with the rear end of the magazine, thus restrainingmovement of the magazine out of the body. The nails are driven by blowsapplied by the knob 114 on the blade driving plunger.

We claim: l

l. A nail driver comprising an elongated body having an upwardlyextending head portion at its forward end and a rearward portion, saidhead portion being formed with a nail delivery passage, said body beingformed with an elongated chamber extending rearwardly from said headportion to said rear portion, a nail magazine movable into and out ofsaid chamber and having a nail guideway in registration andcommunicating with said delivery passage when said magazine ispositioned in said chamber, a pusher slidably mounted in said guideway,a spring for urging said pusher along the guideway toward said headportion to advance a row of nai-ls along the guideway toward saiddelivery passage, releasable means for restraining movement of saidmagazine out of said chamber, said pusher being retractible from lsaidmagazine into said rear portion of the body, and releasable latch meansfor holding said pusher in retracted position in said rear portion ofthe body.

2. A nail driver comprising an elongated body having an upwardlyextending head portion at its forward end and a rear portion, said headportion being formed with a nail delivery passage, said body beingformed with a magazine receiving chamber extending rearwardly from saidhead portion to said rear portion, a nail magazine moveable into and outof said chamber and having an elongated nail guideway in registrationand communicating with said delivery passage when said magazine ispositioned in said chamber, a pusher slidably mounted in said guideway,a spring for urging said pusher forwardly along the guideway toward saidhead portion to advance a row of nails along the guideway to saiddelivery passage, said pusher being retractible from said magazine intosaid rear portion of the body, means carried by -said rear por- -tionand movable into engagement with said magazine to retain the same insaid chamber, a releasable latch means mounted in said rear portion andmovable into latching engagement with said pusher for holding the samein retracted position, said pusher being operable in retracted positionto move said magazine retaining means out of engagement with saidmagazine.

3. A nail driver comprising an elongated body having an upwardlyextending head portion at its forward end and a rear portion, theintermediate portion of `said body being formed with an elongatedmagazine receiving chamber, said head portion being formed with a naildelivery passage, a nail magazine pivotally secured at its forward endto said head portion for movement about said pivot into said chamber andout of said chamber toloading position, said magazine having a nailguideway aligned and communicating with said nail delivery passage whenthe magazine is moved into said chamber, a pusher slidably mounted insaid nail guideway, and a spring cooperating with said pusher for urgingthe same forwardly along the guideway toward said head portion toadvance a row of nails along the guideway for delivery Ito said deliverypassage, said pusher being retractible from said magazine into said rearportion of the body, said magazine having means operable when the sameis moved to outward loading position to prevent forward movement of saidpusher from said rear portion ofthe body.

4. A nail driver comprising a body having an upwardly extending headportion at its forward end formed with a nail delivery passage, amagazine structure for feeding nails to said passage, a plunger slidablymounted in the head portion and having la depending nail driving bladefor movement `downwardly through said passage upon downward movement ofthe plunger to down position to drive a nail through said passageinto awork piece, a. spring for effecting an upward return movement of saidplunger to its up position, -a bearing mounted in said head portion forlateral movement in a direction from said plunger, means yieldinglyrestraining such lateral movement of said bearing, a pawl pivotallymounted at one end in said bearing and extending toward said plunger,said plunger having a side surface confronting said pawl when saidplunger is intermediate its up and down positions, said bearing beingspaced a distance from lthe plane of said surface less than the lengthof said pawl, such that the free end of the pawl will engage saidsurface cant fashion and means yieldingly urging said pawl in positionnormal to said plunger when said plunger is in its up and downpositions.

References Cited in the tile of this patent UNITED STATES PATENTS288,191 Young Nov. 6, 1883 1,048,522 Gibson Dec. 3l, 1912 2,059,021Pankonin Oct. 27, 1936 2,423,821 Anstett July 15, 1947 2,430,321 AnstettNov. 4, 1947 2,768,376 Critchley Oct. 30, 1956 2,781,515 Juilfs Feb. 19,1957 2,931,038 Wandel Apr. 5, 1960

